The MCI_GENERIC_PARMS structure contains the information for MCI command messages that have empty parameter lists. When assigning data to its fields, set the corresponding MCI flags in the lParam1 parameter of mciSendCommand to validate the fields.
typedef struct {
DWORD dwCallback;
} MCI_GENERIC_PARMS;
Fields
dwCallback
The low-order word specifies a window handle used for the MCI_NOTIFY flag.